... Alarm. Set a preset phone number for SOS button, when this button is pressed, T300A1 will send one ... Hijack alarm: In case of danger, push the button hidden in the steering room, and the vehicle ... When the T300C is disconnected to the system (for example, the GPRS signal is weak), the position ... is ok). GPS/GPRS Specification: SOS Button :Driver can press SOS button for emergency General :L1 1575.42MHz, C ...